I'm close to walking away from Slack for a personal group chat and pushing to move to something with either full encryption (Keybase Teams), or proper retention

I'm close to walking away from Slack for a personal group chat and pushing to move to something with either full encryption (Keybase Teams), or proper retention settings/control of ALL messages. Slacks decision to not allow control of message retention combined with them also taking away the ability to delete messages beyond the latest 10,000 is a big problem.